WO2013025222A3 - Outils et procédés améliorés de détection de tubage - Google Patents

Outils et procédés améliorés de détection de tubage Download PDF

Info

Publication number
WO2013025222A3
WO2013025222A3 PCT/US2011/048317 US2011048317W WO2013025222A3 WO 2013025222 A3 WO2013025222 A3 WO 2013025222A3 US 2011048317 W US2011048317 W US 2011048317W WO 2013025222 A3 WO2013025222 A3 WO 2013025222A3
Authority
WO
WIPO (PCT)
Prior art keywords
methods
casing
tools
presented
signals
Prior art date
Application number
PCT/US2011/048317
Other languages
English (en)
Other versions
WO2013025222A2 (fr
Inventor
Michael S. Bittar
Hsu-Hsiang Wu
Original Assignee
Halliburton Energy Services, Inc.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to AU2011375008A priority Critical patent/AU2011375008B2/en
Priority to RU2014106048/03A priority patent/RU2591861C2/ru
Priority to PCT/US2011/048317 priority patent/WO2013025222A2/fr
Priority to EP11870884.1A priority patent/EP2744979B1/fr
Priority to MX2014001803A priority patent/MX358888B/es
Priority to MYPI2014000325A priority patent/MY173034A/en
Priority to EP19151851.3A priority patent/EP3495851B1/fr
Priority to CA2844111A priority patent/CA2844111C/fr
Application filed by Halliburton Energy Services, Inc. filed Critical Halliburton Energy Services, Inc.
Priority to US14/239,364 priority patent/US10145234B2/en
Priority to BR112014003269A priority patent/BR112014003269A2/pt
Priority to CN201180072865.3A priority patent/CN103874936B/zh
Publication of WO2013025222A2 publication Critical patent/WO2013025222A2/fr
Publication of WO2013025222A3 publication Critical patent/WO2013025222A3/fr
Priority to US16/191,152 priority patent/US10301926B2/en

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B47/00—Survey of boreholes or wells
    • E21B47/04—Measuring depth or liquid level
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
    • E21B43/24—Enhanced recovery methods for obtaining hydrocarbons using heat, e.g. steam injection
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
    • E21B43/24—Enhanced recovery methods for obtaining hydrocarbons using heat, e.g. steam injection
    • E21B43/2406—Steam assisted gravity drainage [SAGD]
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B47/00—Survey of boreholes or wells
    • E21B47/02—Determining slope or direction
    • E21B47/022—Determining slope or direction of the borehole, e.g. using geomagnetism
    • E21B47/0228—Determining slope or direction of the borehole, e.g. using geomagnetism using electromagnetic energy or detectors therefor
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B7/00—Special methods or apparatus for drilling
    • E21B7/04—Directional drilling

Landscapes

  • Mining & Mineral Resources (AREA)
  • Geology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Environmental & Geological Engineering (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geophysics (AREA)
  • Electromagnetism (AREA)
  • Geophysics And Detection Of Objects (AREA)
  • Structure Of Receivers (AREA)
  • Arrangements For Transmission Of Measured Signals (AREA)

Abstract

L'invention porte sur des procédés et des outils de détection de position de tubage en fond de trou. Le procédé utilise des outils électromagnétiques (EM) ayant des systèmes d'antenne inclinée pour détecter une position de tubage. Parfois, des conceptions d'antenne inclinée augmentent également la sensibilité des outils EM vis-à-vis de paramètres de formation, ce qui peut conduire à des signaux faux pour la détection de tubage. De plus, il est très difficile de distinguer des signaux mesurés entre une source de tubage et une source de formation. Les procédés présentés aident à la distinction entre les deux sources de façon plus précise. Les procédés et les outils présentés aident également à rendre minimaux ces effets environnementaux, ainsi qu'à améliorer les signaux d'un tubage conducteur environnant. Les procédés de la présente invention portent sur des idées de conception d'outils EM pour déterminer de façon précise une position de tubage dans une certaine distance à une position de tubage.
PCT/US2011/048317 2011-08-18 2011-08-18 Outils et procédés améliorés de détection de tubage WO2013025222A2 (fr)

Priority Applications (12)

Application Number Priority Date Filing Date Title
EP19151851.3A EP3495851B1 (fr) 2011-08-18 2011-08-18 Outils et procédés de détection améliorée de boîtier
PCT/US2011/048317 WO2013025222A2 (fr) 2011-08-18 2011-08-18 Outils et procédés améliorés de détection de tubage
EP11870884.1A EP2744979B1 (fr) 2011-08-18 2011-08-18 Procédés améliorés de détection de tubage
MX2014001803A MX358888B (es) 2011-08-18 2011-08-18 Herramientas y métodos mejorados de detección de revestimiento.
MYPI2014000325A MY173034A (en) 2011-08-18 2011-08-18 Improved casing detection tools and methods
AU2011375008A AU2011375008B2 (en) 2011-08-18 2011-08-18 Improved casing detection tools and methods
CA2844111A CA2844111C (fr) 2011-08-18 2011-08-18 Outils et procedes ameliores de detection de tubage
RU2014106048/03A RU2591861C2 (ru) 2011-08-18 2011-08-18 Способ и инструмент для обнаружения обсадных труб
US14/239,364 US10145234B2 (en) 2011-08-18 2011-08-18 Casing detection tools and methods
BR112014003269A BR112014003269A2 (pt) 2011-08-18 2011-08-18 método de perfilagem furo abaixo, e, ferramenta de detecção de revestimento
CN201180072865.3A CN103874936B (zh) 2011-08-18 2011-08-18 改进的套管检测工具和方法
US16/191,152 US10301926B2 (en) 2011-08-18 2018-11-14 Casing detection tools and methods

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/US2011/048317 WO2013025222A2 (fr) 2011-08-18 2011-08-18 Outils et procédés améliorés de détection de tubage

Related Child Applications (2)

Application Number Title Priority Date Filing Date
US14/239,364 A-371-Of-International US10145234B2 (en) 2011-08-18 2011-08-18 Casing detection tools and methods
US16/191,152 Continuation US10301926B2 (en) 2011-08-18 2018-11-14 Casing detection tools and methods

Publications (2)

Publication Number Publication Date
WO2013025222A2 WO2013025222A2 (fr) 2013-02-21
WO2013025222A3 true WO2013025222A3 (fr) 2014-03-20

Family

ID=47715626

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2011/048317 WO2013025222A2 (fr) 2011-08-18 2011-08-18 Outils et procédés améliorés de détection de tubage

Country Status (9)

Country Link
US (2) US10145234B2 (fr)
EP (2) EP2744979B1 (fr)
CN (1) CN103874936B (fr)
AU (1) AU2011375008B2 (fr)
BR (1) BR112014003269A2 (fr)
CA (1) CA2844111C (fr)
MX (1) MX358888B (fr)
RU (1) RU2591861C2 (fr)
WO (1) WO2013025222A2 (fr)

Families Citing this family (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011123379A1 (fr) 2010-03-31 2011-10-06 Halliburton Energy Services, Inc. Technique de correction de forage à pas multiples pour outils à induction à composants multiples
US9115569B2 (en) 2010-06-22 2015-08-25 Halliburton Energy Services, Inc. Real-time casing detection using tilted and crossed antenna measurement
EP2744979B1 (fr) 2011-08-18 2019-02-20 Halliburton Energy Services, Inc. Procédés améliorés de détection de tubage
WO2013066297A1 (fr) 2011-10-31 2013-05-10 Halliburton Energy Services, Inc. Systèmes multicomposants de diagraphie par induction et procédés d'utilisation en temps réel d'une correction de trou de forage d'obm
EP2836860A4 (fr) 2012-06-25 2015-11-11 Halliburton Energy Services Inc Systèmes de diagraphie à antennes inclinées et procédés donnant des signaux de mesure robustes
RU2648785C2 (ru) 2013-12-18 2018-03-28 Хэллибертон Энерджи Сервисиз, Инк. Волоконно-оптический контроль тока для электромагнитной дальнометрии
MX2016014273A (es) 2014-05-01 2017-02-06 Halliburton Energy Services Inc Metodos y sistemas de tomografia entre pozos que utilizan un segmento de tuberia de revestimiento con al menos un arreglo de cruce de transmision.
CA2947008C (fr) 2014-05-01 2020-06-30 Halliburton Energy Services, Inc. Procedes et systemes de forage guides utilisant un segment de boitier comprenant au moins un agencement croise de transmission
EP3129590B1 (fr) 2014-05-01 2020-09-09 Halliburton Energy Services, Inc. Segment de tubage ayant au moins un agencement de croisement de transmission
CA2946857C (fr) 2014-05-01 2019-10-29 Halliburton Energy Services, Inc. Procedes de commande de production multilateraux et systemes utilisant un segment de tubage ayant au moins un agencement de croisement de transmission
US9863239B2 (en) * 2014-06-19 2018-01-09 Evolution Engineering Inc. Selecting transmission frequency based on formation properties
WO2016061171A1 (fr) * 2014-10-15 2016-04-21 Schlumberger Canada Limited Détection de déploiement de tubage de trou de forage
US10267945B2 (en) * 2014-10-20 2019-04-23 Schlumberger Technology Corporation Use of transverse antenna measurements for casing and pipe detection
CN104481506B (zh) * 2014-12-05 2017-04-12 贵州航天凯山石油仪器有限公司 一种套管错断方位检测方法
GB2570814B (en) 2014-12-30 2019-11-13 Halliburton Energy Services Inc Locating multiple wellbores
CN107725025B (zh) * 2016-08-10 2023-10-20 中国石油化工股份有限公司 多功能井筒检测装置及检测方法
US10508534B2 (en) 2016-09-28 2019-12-17 Halliburton Energy Services, Inc. Planning and real time optimization of electrode transmitter excitation
US10883361B2 (en) * 2016-10-06 2021-01-05 Halliburton Energy Services, Inc. Modular electromagnetic ranging system for determining location of a target well
AU2017417164B2 (en) * 2017-06-02 2023-05-11 Halliburton Energy Services, Inc. Signal processing of multi-sub rotational resistivity logging tool
WO2018226233A1 (fr) * 2017-06-08 2018-12-13 Halliburton Energy Services, Inc. Télémétrie de fond de trou à l'aide de contraintes continues dans l'espace
GB2580244B (en) 2017-10-26 2022-03-09 Halliburton Energy Services Inc Determination on casing and formation properties using electromagnetic measurements
CN109326105B (zh) * 2018-10-26 2021-03-02 东莞市九思自动化科技有限公司 一种报警器检测装置

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080078580A1 (en) * 1999-01-28 2008-04-03 Halliburton Energy Services, Inc. Tool for azimuthal resistivity measurement and bed boundary detection
US20090309600A1 (en) * 2008-06-11 2009-12-17 Jean Seydoux Measurement of formation parameters using rotating directional em antenna
US7825664B2 (en) * 2004-07-14 2010-11-02 Schlumberger Technology Corporation Resistivity tool with selectable depths of investigation
US20110006773A1 (en) * 2008-01-18 2011-01-13 Hilliburton Energy Services, Inc. EM-Guided Drilling Relative to an Existing Borehole

Family Cites Families (39)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3748573A (en) * 1971-06-21 1973-07-24 Shell Oil Co Electrical logging system for use with a drill string
MY112792A (en) * 1994-01-13 2001-09-29 Shell Int Research Method of creating a borehole in an earth formation
US5892460A (en) 1997-03-06 1999-04-06 Halliburton Energy Services, Inc. Logging while drilling tool with azimuthal sensistivity
US6703838B2 (en) * 1998-04-13 2004-03-09 Schlumberger Technology Corporation Method and apparatus for measuring characteristics of geological formations
US6163155A (en) 1999-01-28 2000-12-19 Dresser Industries, Inc. Electromagnetic wave resistivity tool having a tilted antenna for determining the horizontal and vertical resistivities and relative dip angle in anisotropic earth formations
US6476609B1 (en) 1999-01-28 2002-11-05 Dresser Industries, Inc. Electromagnetic wave resistivity tool having a tilted antenna for geosteering within a desired payzone
US6257334B1 (en) 1999-07-22 2001-07-10 Alberta Oil Sands Technology And Research Authority Steam-assisted gravity drainage heavy oil recovery process
US7059428B2 (en) * 2000-03-27 2006-06-13 Schlumberger Technology Corporation Monitoring a reservoir in casing drilling operations using a modified tubular
US7018528B2 (en) 2003-02-14 2006-03-28 Lee F Donald Portable purifying system
US7382135B2 (en) 2003-05-22 2008-06-03 Schlumberger Technology Corporation Directional electromagnetic wave resistivity apparatus and method
US7010429B2 (en) * 2003-08-22 2006-03-07 Halliburton Energy Services, Inc. Induction logging system and method featuring multi-frequency skin effect correction
US7755361B2 (en) * 2004-07-14 2010-07-13 Schlumberger Technology Corporation Apparatus and system for well placement and reservoir characterization
US7786733B2 (en) * 2004-07-14 2010-08-31 Schlumberger Technology Corporation Apparatus and system for well placement and reservoir characterization
EP1662673B1 (fr) * 2004-11-26 2017-01-25 Services Pétroliers Schlumberger Procédé et appareil pour la communication à travers un tubage
US8026722B2 (en) 2004-12-20 2011-09-27 Smith International, Inc. Method of magnetizing casing string tubulars for enhanced passive ranging
US7568532B2 (en) * 2006-06-05 2009-08-04 Halliburton Energy Services, Inc. Electromagnetically determining the relative location of a drill bit using a solenoid source installed on a steel casing
CA2655200C (fr) 2006-07-11 2013-12-03 Halliburton Energy Services, Inc. Ensemble d'outil modulaire de pilotage geologique de puits
WO2008008346A2 (fr) 2006-07-12 2008-01-17 Halliburton Energy Services, Inc. Procédé et appareil pour construire une antenne inclinée
US7703548B2 (en) * 2006-08-16 2010-04-27 Schlumberger Technology Corporation Magnetic ranging while drilling parallel wells
CN101460698B (zh) * 2006-12-15 2013-01-02 哈里伯顿能源服务公司 具有旋转天线结构的天线耦合元件测量工具
US7962287B2 (en) 2007-07-23 2011-06-14 Schlumberger Technology Corporation Method and apparatus for optimizing magnetic signals and detecting casing and resistivity
US7839149B2 (en) 2008-01-11 2010-11-23 Baker Hughes Incorporated Multi-component resistivity logging tool with multiple antennas using common antenna grooves
US8756015B2 (en) * 2008-08-20 2014-06-17 Baker Hughes Incorporated Processing of azimuthal resistivity data in a resistivity gradient
US8427162B2 (en) * 2008-08-25 2013-04-23 Baker Hughes Incorporated Apparatus and method for detection of position of a component in an earth formation
US8278928B2 (en) * 2008-08-25 2012-10-02 Baker Hughes Incorporated Apparatus and method for detection of position of a component in an earth formation
US20110291855A1 (en) * 2008-10-01 2011-12-01 Homan Dean M Logging tool with antennas having equal tilt angles
US8089268B2 (en) * 2009-03-24 2012-01-03 Smith International, Inc. Apparatus and method for removing anisotropy effect from directional resistivity measurements
US8159227B2 (en) 2009-05-11 2012-04-17 Smith International Inc. Methods for making directional resistivity measurements
RU2405106C1 (ru) * 2009-06-18 2010-11-27 Государственное образовательное учреждение высшего профессионального образования Российский государственный университет нефти и газа им. И.М. Губкина Система контроля процесса взаимного ориентирования стволов при кустовом бурении нефтяных и газовых скважин
US8669765B2 (en) 2010-03-15 2014-03-11 Baker Hughes Incorporated Estimating a parameter of interest with transverse receiver toroid
MY159410A (en) 2010-04-15 2017-01-13 Halliburton Energy Services Inc Processing and geosteering with a rotating tool
CN101852078B (zh) 2010-06-08 2013-01-16 中国石油大学(北京) 一种双螺线管组随钻电磁测距导向系统
US8749243B2 (en) 2010-06-22 2014-06-10 Halliburton Energy Services, Inc. Real time determination of casing location and distance with tilted antenna measurement
US8917094B2 (en) 2010-06-22 2014-12-23 Halliburton Energy Services, Inc. Method and apparatus for detecting deep conductive pipe
US9115569B2 (en) 2010-06-22 2015-08-25 Halliburton Energy Services, Inc. Real-time casing detection using tilted and crossed antenna measurement
US9360582B2 (en) 2010-07-02 2016-06-07 Halliburton Energy Services, Inc. Correcting for magnetic interference in azimuthal tool measurements
US8952700B2 (en) * 2011-01-28 2015-02-10 Precision Energy Services, Inc. Method for minimizing delays while drilling using a magnetic ranging apparatus
WO2012121697A1 (fr) 2011-03-07 2012-09-13 Halliburton Energy Services, Inc. Procédés de traitement de signaux permettant d'orienter une cible souterraine
EP2744979B1 (fr) 2011-08-18 2019-02-20 Halliburton Energy Services, Inc. Procédés améliorés de détection de tubage

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080078580A1 (en) * 1999-01-28 2008-04-03 Halliburton Energy Services, Inc. Tool for azimuthal resistivity measurement and bed boundary detection
US7825664B2 (en) * 2004-07-14 2010-11-02 Schlumberger Technology Corporation Resistivity tool with selectable depths of investigation
US20110006773A1 (en) * 2008-01-18 2011-01-13 Hilliburton Energy Services, Inc. EM-Guided Drilling Relative to an Existing Borehole
US20090309600A1 (en) * 2008-06-11 2009-12-17 Jean Seydoux Measurement of formation parameters using rotating directional em antenna

Also Published As

Publication number Publication date
US20190078433A1 (en) 2019-03-14
WO2013025222A2 (fr) 2013-02-21
CN103874936A (zh) 2014-06-18
EP2744979B1 (fr) 2019-02-20
RU2591861C2 (ru) 2016-07-20
CA2844111A1 (fr) 2013-02-21
US10301926B2 (en) 2019-05-28
MX2014001803A (es) 2014-07-28
US10145234B2 (en) 2018-12-04
AU2011375008A1 (en) 2014-02-20
AU2011375008B2 (en) 2015-09-24
EP2744979A2 (fr) 2014-06-25
US20140191879A1 (en) 2014-07-10
EP3495851A1 (fr) 2019-06-12
CN103874936B (zh) 2017-11-14
EP3495851B1 (fr) 2022-12-14
CA2844111C (fr) 2016-11-08
EP2744979A4 (fr) 2015-07-01
BR112014003269A2 (pt) 2017-03-14
RU2014106048A (ru) 2015-09-27
MX358888B (es) 2018-08-28

Similar Documents

Publication Publication Date Title
WO2013025222A3 (fr) Outils et procédés améliorés de détection de tubage
AU2018226450B2 (en) Electroseismic surveying in exploration and production environments
CA2854746A1 (fr) Techniques de positionnement dans les environnements multipuits
GB201320082D0 (en) Enhanced position detector in laser tracker
WO2014137810A3 (fr) Techniques de corrélation pour arpentage électrosismique et sismoélectrique passif
GB2534501A (en) Fracture detection and characterization using resistivity images
MY167753A (en) Multicomponent borehole radar systems and methods
WO2013016453A3 (fr) Détection de véhicule à faible puissance
WO2012145583A3 (fr) Transmetteur électromagnétique forage-surface
WO2014011776A3 (fr) Systèmes, procédés et appareil pour la détection d'objets métalliques dans un espace prédéterminé
MX348421B (es) Aparatos, metodos, y sistemas de medicion de resistividad mejorada.
WO2013028515A3 (fr) Systèmes de détection de fuite de puits de forage et leurs procédés d'utilisation
MX2016002303A (es) Deteccion de corrosion y sarro en multiples tuberias en el fondo del pozo usando sensores conformables.
GB2470688A (en) Determining directional propagation attributes of a seismic event
WO2013040497A3 (fr) Systèmes et procédé de détection des modifications de l'environnement faisant appel à des sources lumineuses en tant que détecteurs
WO2012106017A3 (fr) Appareil et procédés pour suivre l'emplacement d'un fluide de fracturation dans une formation souterraine
WO2011119318A3 (fr) Système et procédé permettant de corriger les effets de forage dans une mesure de porosité aux neutrons
WO2008136141A1 (fr) Procédé et dispositif de détection de rayonnement radioactif utilisant des informations d'énergie et de position
WO2014199179A3 (fr) Détection de foration descendante
GB2566204A (en) Electromagnetic casing inspection tool with azimuthal sensitivity
AU2016219651A1 (en) Determining the depth and orientation of a feature in a wellbore
GB2493894A (en) Fluid resistivity sensor
WO2009039161A3 (fr) Systèmes et procédés de placage de transparence à l'aide de signaux sur trajets multiples
MX2016002360A (es) Deteccion de alta resolucion de fallas en el interior del pozo mediante el uso de coincidencia de patrones.
MX2012013510A (es) Detección de herramienta en la tubería.

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 11870884

Country of ref document: EP

Kind code of ref document: A2

ENP Entry into the national phase

Ref document number: 2844111

Country of ref document: CA

WWE Wipo information: entry into national phase

Ref document number: MX/A/2014/001803

Country of ref document: MX

WWE Wipo information: entry into national phase

Ref document number: 14239364

Country of ref document: US

Ref document number: 2011870884

Country of ref document: EP

ENP Entry into the national phase

Ref document number: 2011375008

Country of ref document: AU

Date of ref document: 20110818

Kind code of ref document: A

ENP Entry into the national phase

Ref document number: 2014106048

Country of ref document: RU

Kind code of ref document: A

REG Reference to national code

Ref country code: BR

Ref legal event code: B01A

Ref document number: 112014003269

Country of ref document: BR

ENP Entry into the national phase

Ref document number: 112014003269

Country of ref document: BR

Kind code of ref document: A2

Effective date: 20140211